Production of $^{4}$He and $^{4}\overline{\textrm{He}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV at the LHC

Results on the production of 4 He and He‾4 nuclei in Pb–Pb collisions at sNN=2.76TeV in the rapidity range |y|<1 , using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0–10% central events are found to be dN/dyHe4=(0.8±0.4(stat)±0.3(syst))×10−6 and dN/dyHe‾4=(1.1±0.4(stat)±0.2(syst))×10−6 , respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature ( Tchem=156MeV ) as for light hadrons. The measured ratio of He‾4/4He is 1.4±0.8(stat)±0.5(syst) .

Note:

17 pages, 3 captioned figures, 1 table, authors from page 12, submitted to Nucl. Phys. A, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4087

Pb–Pb collisions
ALICE detector
LHC
Anti-nuclei
heavy ion: scattering
freeze-out: temperature
freeze-out: chemical
rapidity: density
model: thermal
CERN LHC Coll

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Production of 4^{4}4He and 4He‾^{4}\overline{\textrm{He}}4He in Pb-Pb collisions at sNN\sqrt{s_{\mathrm{NN}}}sNN​​ = 2.76 TeV at the LHC

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Production of $^{4}$ He and $^{4}\overline{\textrm{He}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV at the LHC